Willis d



(No Model.) n Y W. D. SHERMAN. CORE FOR DRAIN TILE MOLDS.

110.461,453. Patented Oct. 20, 1891.

'mz noms versus ce., mow-mno., mswmorsn, u. c.

UNITED STATES PATENT OFFICE.

IVILLIS D. SHERMAN, OF OMAHA, NEBRASKA, ASSIGNOR TO THE UNION HYDRAULICDRAIN TILE COMPANY, OF SAME PLACE.

CORE FOR DRAIN-TILE MOLDS.

SPECIFICATION forming part of Letters Patent No. 461,453, dated October20, 1891. Application filed December l1, 1890. Serial No.;374,358. (Nomodel.)

To all whom t may concern:

Be it known that I, WILLIS D. SHERMAN, a citizen of the United States,and a resident of Omaha, in the count-y of Douglas and State ofNebraska, have invented certain new and useful Improvements in Cores forSewer-Pipe and Drain-Tile Molds; and I do hereby declare that thefollowing is a full, clear, and eX- act description of the invention,which will enableothers skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,which form a part of this specification.

My invention rela-tes to improvements in contractible cores forsewer-pipe and draintile molds.

In making sewer-pipe and drain-tile and other similar` articles ofconcrete or cement a' mold is employed consisting of an outer shell andan inner core with an intervening space between corresponding with thepipe to be made. This space isgradually filled in with damp or wetconcrete or other material, which is tamped or compressed by means oftamping-bars during the operation of filling, so that a homogeneous pipewill be the result. These tamping-bars may be operated by hand or bymachinery, as may be found most desirable. Owing to this compressing ortamping of the material of which the pipe is composed and thecontraction due to evaporation, it is very dicult to remove the core,the pipe frequently being injured and destroyed in the attempt.

.The object of my invention, therefore, lis to provide a contractiblecore for sewer-pipe and drain-tile molds which can be caused to collapseor be drawn out of contact with the interior of the pipe, thus allowingit to be read-` In the said drawings the core is shown as being composedof two outer and two inner sections designated by the reference-numerals l l and 2 2, each consisting of a curved vertical plate ofcast-iron or other suitable material. The outer sections l l at theirends are preferably slightly increased in thickness and beveled, asshown at 3, Fig. 1,forming av beveled or inclined face, extending fromtop to bottom thereof. The inner sections 2 have their ends bentinwardly at an angle to the remaining portion, forming vertical wings 5,which it snugly against the inclined faces which overlap the same. Thesewings 5 at suitable intervals are provided with slots 6, through whichpass the headed pins 7 ,which are screw-threaded at their ends andreceived in corresponding holes in the faces. The heads of` these pinsbear loosely against the wings 5, so that said wings and the inclinedfaces can slide upon each other.

Located upon the interior of the sections l, near the top and bottomthereof, are vertical' guideways, each consisting of two parallel ribsS, which may be connected at each end by the cross-ribs 9. These waysare designed to receive the free ends of the bars or rods 10, which aresecured at their other ends to a vertical bar l2, located approximatelyin the center of the core. Pivoted to this bar I2 near the top andbottom are arms 13, which are pivoted at their other ends to lugs I4,secured to the sections 2.

Formed with or secured to bar 12 is an upwardly-extending rod l5, whichcarries a cover 16, corresponding in shape with the core, and which titsdown upon the tops of the sections, thus preventing the entrance oflling material to the interiorof the core. The cover and the sections land 2 Where they meet,when the cover is in place, are provided withannular recesses, so as to make a snug and close t. The cover isprovided with a central boss I7 and a. set-screw 18, by which it isadjustably secured to the rod 15.

The operation will be readily understood. When the core is placed withinthe mold, the parts will occupy the positions shown in the drawings. Itwill then be seen that the outer portions of the sections 1 and 2 wherethey meet will be flush with each other, thus pre- IOO senting a smoothunbroken surface of a contour corresponding with the interior of thepipe to be produced, with the cover-16 snugly seating upon the upperedges of said sections. After the filling material has been inserted inthe space between the core and shell and tamped down t0 form the pipeAand it is desired to Withdraw the core, the rod 15 is grasped bysuitable machinery or by hand and drawn upward. This will cause the barl2 to be elevated, raising the cover out of contact with the sectionsand actuating the pivotedarms 13, which will draw the sections 2 2inwardly-or toward the center, which in turn, by means of pin-and-slotconnections with sections l, will also draw in Vthe latter, thuscausing` the core to be contracted and forced out of contact with theinterior of the tile and enablingittobereadilywithdrawn. The bars orrods 10, working in the guideways, serve to steady and guide the bar l2and move upwardly therewith. It will be seen that the free ends ot'these rods l() do not quite extend to the sections l where the latterare extended, as shown in the drawings, a slight space being lefttherebetween lo provide for the contraction of said sections. When thecore is returned to the mold and the central bar pushed down, thesections will be expanded to again assume their proper positions.

While I have illustrated in the drawings a core adapted to makeegg-shaped or oval pipe, itis obvious that the same may be employed inconnection with circular, square, rectangular, or other shaped pipewithout departing from the principle of the invention, and therefore Ido not wish to be understood as limiting myself to any particular formor shape of core or of the sections composing the same.

The invention will be found to be peculiarly adapted for employment inconnection with machines for making sewer-pipe and draintile, such as isdisclosed in an application filed byme of even date herewith, Serial No.374,356, and with a concurrent application for an mprovement in shellsfor sewer-pipe and draintile molds, Serial No. 374,359, although it isequally well adapted for use with other styles of machines andalso forhand-made pipe.

Having thus described my invention, what I claim is- A core forsewer-pipe and drain-tile molds, consisting of the outer sections havingbeveled ends, the inner sections having inclined slotted wings, theheaded bolts, the vertical bar, the arms pivoted to said bar and to theinner sections, the guideways on the outer sections, and the rodslworking in said guide- Ways and secured to the vertical bar,substantially as described.

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

WILLIS D. SHERMAN.

